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authorRichard Kuo <rkuo@codeaurora.org>2011-11-01 03:52:22 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-01 18:34:20 +0400
commit65c3d7c525414d672c849d8696d6b8a3ebbae059 (patch)
tree7d55319ff4ff54c398aa1e1c6ee9c494ec898e8d /arch/hexagon/include/asm/dma-mapping.h
parent5df87c1556515dfae504da342990821f407a8c99 (diff)
downloadlinux-65c3d7c525414d672c849d8696d6b8a3ebbae059.tar.xz
Hexagon: Provide DMA implementation
Signed-off-by: Richard Kuo <rkuo@codeaurora.org> Signed-off-by: Linas Vepstas <linas@codeaurora.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/hexagon/include/asm/dma-mapping.h')
-rw-r--r--arch/hexagon/include/asm/dma-mapping.h101
1 files changed, 101 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/dma-mapping.h b/arch/hexagon/include/asm/dma-mapping.h
new file mode 100644
index 000000000000..448b224ba4ef
--- /dev/null
+++ b/arch/hexagon/include/asm/dma-mapping.h
@@ -0,0 +1,101 @@
+/*
+ * DMA operations for the Hexagon architecture
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef _ASM_DMA_MAPPING_H
+#define _ASM_DMA_MAPPING_H
+
+#include <linux/types.h>
+#include <linux/cache.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-debug.h>
+#include <linux/dma-attrs.h>
+#include <asm/io.h>
+
+struct device;
+extern int bad_dma_address;
+
+extern struct dma_map_ops *dma_ops;
+
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
+#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+ if (unlikely(dev == NULL))
+ return NULL;
+
+ return dma_ops;
+}
+
+extern int dma_supported(struct device *dev, u64 mask);
+extern int dma_set_mask(struct device *dev, u64 mask);
+extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
+extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ enum dma_data_direction direction);
+
+#include <asm-generic/dma-mapping-common.h>
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+ if (!dev->dma_mask)
+ return 0;
+ return addr + size - 1 <= *dev->dma_mask;
+}
+
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+ if (dma_ops->mapping_error)
+ return dma_ops->mapping_error(dev, dma_addr);
+
+ return (dma_addr == bad_dma_address);
+}
+
+static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flag)
+{
+ void *ret;
+ struct dma_map_ops *ops = get_dma_ops(dev);
+
+ BUG_ON(!dma_ops);
+
+ ret = ops->alloc_coherent(dev, size, dma_handle, flag);
+
+ debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
+
+ return ret;
+}
+
+static inline void dma_free_coherent(struct device *dev, size_t size,
+ void *cpu_addr, dma_addr_t dma_handle)
+{
+ struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+ BUG_ON(!dma_ops);
+
+ dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
+
+ debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
+}
+
+#endif